SINR-Aware Spatial Reuse for Wireless Access Points
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Solution Overview
Problem
Current wireless communication systems face interference issues due to the lack of SINR awareness in spatial reuse, leading to degraded performance as they do not effectively account for interference between overlapping Basic Service Sets (BSSs), resulting in impaired transmissions and increased packet error rates.
Innovation Solution
Implementing a system that computes and utilizes signal-to-interference-plus-noise ratio (SINR) awareness to adjust transmit power back-off and transmission parameters, allowing access points to coordinate transmissions and minimize interference between overlapping BSSs, thereby optimizing spatial reuse.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If spatial reuse is implemented without SINR awareness, then spectral efficiency is improved by allowing concurrent transmissions, but interference between overlapping BSSs increases leading to degraded transmission reliability
Solution Approach 1:
The patent implements feedback mechanisms where access points exchange SINR information and transmission status with neighboring APs. This feedback loop enables dynamic adjustment of transmit power and transmission parameters based on actual interference conditions, allowing the system to maintain high spectral efficiency while ensuring transmission reliability through continuous monitoring and adaptation.
Solution Approach 2:
The system dynamically changes transmission parameters including transmit power levels, modulation schemes, and coding rates based on computed SINR values. By adjusting these parameters in response to interference conditions, the system optimizes the trade-off between spectral efficiency and transmission reliability, allowing concurrent transmissions when SINR is favorable while maintaining reliability when interference is high.
2Reliability
If transmit power is increased to improve signal quality, then transmission reliability is improved, but interference to other BSSs increases reducing overall spectral efficiency
Solution Approach 1:
The patent applies local quality by allowing different transmit power levels and transmission parameters for different spatial locations and BSSs. Each access point computes its transmit power back-off based on local interference conditions and SINR measurements, enabling high power transmissions in low-interference areas while maintaining low power in high-interference areas, thus optimizing both reliability and spectral efficiency locally.
Solution Approach 2:
The system implements dynamic transmit power adjustment where power levels are not fixed but continuously adapted based on real-time SINR measurements and interference conditions. This dynamic behavior allows the system to increase power when needed for reliability while decreasing power to protect spectral efficiency, creating an optimal balance that responds to changing wireless conditions.
3Reliability
If SINR-aware coordination is implemented between APs, then interference is reduced improving transmission reliability, but system complexity increases due to additional computation and communication overhead
Solution Approach 1:
The patent applies preliminary action by having access points compute predicted SINR values and determine transmit power back-off levels before actual transmissions begin. This preliminary computation during training transmission times allows the system to establish optimal transmission parameters in advance, reducing the need for complex real-time coordination during data transmissions and thereby managing system complexity while maintaining reliability.
Data Source
AI summary
A system for wireless communication may include data processing hardware and memory hardware in communication with the data processing hardware. The memory hardware may store instructions that, when executed on the data processing hardware, cause the data processing hardware to perform operations including: receiving, at a second access point (AP) from a first AP, an identity of a first receiving station (STA) and a first predicted signal-to-interference-plus-noise ratio (SINR) at the first STA, wherein the first STA is operable to receive a transmission from the first AP and the first predicted SINR is computed when the second AP begins transmitting; computing, at the second AP, a second predicted SINR at a second STA when the first AP begins transmitting; computing, at the second AP, a first transmit power back-off based on the first predicted SINR and the second predicted SINR.